Air-pump.



G. SCHMIDT.

AIR PUMP. APPLICATION FILED NOV. 28, 1910.

11,015,081 I Patented Jan. 16, 1912.

2 SHEETS-SHEET l.

COLUMBIA PLANOflRAPH,co..WASHING'RSN. D. I;

G. SCHMIDT.

AIR PUMP. APPLICATION P111211 NOV. 28, 1910.

1,015,087. Patented Jan. 16, 1 912.

2 SHEETS-SHEET 2.

LE :5, /.3 v W Id 7* 6 V W 77% z 3 v X W 351 m M GOTTFRIE D SCHMIDT, OFHAZLETON, PENNSYLVANIA.

AIR-PUMP.

Specification of Letters Patent.

Application filed November 28, 1910.

Patented Jan. 16,1912.

Serial No. 594,578.

To all whomz't may concern Be it known that I, Gorrrnmo SCHMIDT, acitizen of the United States, residing at Hazleton, in the county ofLuzerne and State of Pennsylvania, have invented new and usefulImprovements in Air-Pumps, of which the following is a specification.

-This invention relates to air pumps, and has for its object to providea simple, strong and economical double cylinder pump, comprising fewparts compactly assembled in a rigid frame with the cylinders inalinement and a single reciprocating piston rod having a piston head oneach end, and means intermediate said ends for converting rotary motionof the driving shaft into rectilinear movement for operating the pump.

A further object of the invention relates to the novel frame supportingthe several parts of the air pump which is preferably a unitary casting,simple, compact and reversible thereby enabling the parts to beassembled quickly and accurately and with the fewest possible number ofconnections.

With these and other objects in view the invention consists of thecombination and arrangement of parts hereinafter described and claimedand illustrated in the accompanying drawings in which Figure 1 is anelevation of the improved pump, and Fig. 2 a vertical sectional view onthe line 22 of Fig. 1.

In the drawing, A indicates the frame comprising a vertical column 1,from the ends of which on one side project brackets or plates 2 and 3respectively, parallel to each other and perpendicular to the column.The column and brackets are preferably cast in one piece, thus providinga strong rigid support for a motor B, two pump cylinders 4 and 5 and thedriving shaft 6. Instead of placing the column vertically, as shown, itmay be secured in a horizontal or angular position if desired. Thebottom bracket plate or foot 2 is provided with holes through whichbolts 8 pass for fastening the frame A to a suitable base 9. Holes aremade in the upper bracket plate or shelf 3 for bolts 10 which secure themotor B, in this instance an electric motor, in place on the top of theshelf. The inner or opposing sides of the two plates 2 and 3 have formedthereon projecting seats 11 against which the closed heads 12 of therespective cylinders 4 and 5 bear, the latter being held rigidly and inaxial alinement by means of bolts 13 passing through the plates 2 and 3into the cylinder heads 12 as shown. It is to be noted that both ends ofthe column 1 are alike, and that the plates 2 and 3 are similar in everyrespect. It follows therefore that either end of the frame A may beplaced uppermost when the parts are assembled. The faces of the twoseats 11 may be finished simultaneously and the holes for the bolts 13bored at one operation.

Within each cylinder 1 and 5 is a piston head 14 connected together by asingle piston rod 15 having a yoke shaped intermediate section 16 formedWith a central longitudinal opening 17 therethrough into which projectsone end of the horizontal driving shaft 6 journaled in bearings 18carried by the column 1. The shaft 6 passes through the column 1 midwaybetween the plates 2 and 3, and has keyed on its end, outside thecolumn, a grooved or other type of driving wheel 19. A collar 20, boltedon the shaft inside the column, prevents longitudinal movement of saidshaft. A belt 7 connects the motor B with the driving wheel 19.

Keyed on the inner end of the shaft 6 within the yoke section 16 is atoothed segment 21 adapted to alternately engage racks 22 and 23 on theinner faces of the straight portions 24: of yoke section 16 for thepurpose of reciprocating the pistons. The racks 22, 23, are removablefrom the yoke section,,and preferably seated in depressions 25 in thestraight portions 2i and held in place by bolts 26 passing through saidstraight portions into the rear of the racks. The length of pistonstroke may be changed by employing a larger or smaller gear segment 21and by using racks having backs of different thicknesses, or by placingfiller pieces 27 between the racks and the bottoms of the depressions25. The pump cylinders 4.- and 5 are, in this instance, single actingwith inlet valves 30, outlet valves 31 and a pipe line 32 leading fromthe outlet valves 31 to a storage or pressure tank, or to the point ofdistribution or use.

What I claim is 1. In a pump, a frame comprising a column formed with alaterally projecting bracket or plate at each end perpendicular to saidcolumn and having a seat on its inner side, said brackets or platesbeing similar to each other in all respects and lying in parallelrelation with each other, bearings in said column midway between saidbrackets, a driving shaft mounted in said bearings parallel to saidbrackets, a cylinder secured on each seat on the inner side of thebrackets and projecting toward each other and in the same axial line, apiston in each cylinder, a piston rod formed with an intermediate yokejoining said pistons, a gear segment on one end of said shaft adapted toalternately engage said racks as the shaft rotates for operating thepistons, a driving wheel on the opposite end of said shaft and on theouter side of the column, and driving means mounted on one of saidprojecting brackets connected to said driving means.

2. In a pump, an integral frame compriswitnesses.

GOTTFRIED SCHMIDT. Witnesses:

TESSIE HUTH, PETER SCHNEIDER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington, D. C.

